I have had real good success fertilizing in late April with Fox Farm Japanese Maple fertilizer 4 … If you plant to use regular garden fertilizer on your Japanese maple you might as … Garden Fertilizer Kills Japanese Maples and other Plants. Mistake number one is to give the maple large amounts of nitrogen in the first and second years. The dwarf and smaller maple can use pruning fairly often but only to make small incremental change in shape and form. Maple Dwarf – Pruning, Winter Care and Fertilizing. Apply a water-based fertilizer, diluted to half-strength, when growth begins in the spring. Feed young maples only once a year. To start one or more potted Japanese maples, you need a large container, good potting soil and a partially sunny location for it. The first feeding should take place in early spring (before the leaves emerge) and should be followed up with a second feeding in July. Fertilizing Japanese Maples - Notice on the right there is now an organic fertilizer designed specifically for Japanese Maples. Fertilize sparingly. Happy Frog Japanese Maple Fertilizer is specifically formulated for use on Japanese maples, lilies, evergreens, hydrangeas, junipers, dogwoods, flowering ornamentals, and other low pH feeders. Japanese maples, like most other trees, need to establish a solid, strong, root system after being planted before the homeowner can start a proper fertilizer regimen; much to the dismay of the homeowner this could take 1-2 growing seasons after planting a tree in their garden or landscape. A small amount of organic slow release fertilizer in the spring would be much better for your plants. i purchased a 3-4 year old japanese maple (murasaki kiyohime) and it was delivered last week. You might want to try it. This unique blend of fertilizers and microorganisms delivers nutrition where your plants need it most. Fertilizing Your Japanese Maple Japanese maples are not heavy feeders but do need to be lightly fertilized a few times a year. Happy Frog ® Japanese Maple Fertilizer is specifically formulated for use on Japanese maples, lilies, evergreens, hydrangeas, junipers, dogwoods, flowering ornamentals, and other low pH feeders. It’s not that hard to start growing Japanese maples in containers. I immediately repotted it from the 1 gallon container it came in to a 3 gallon pot i purchased. As Matt Nichols of MrMaple.com says, “The number one thing people do wrong with Japanese maples is they over-love them.” So every time you get the urge to bestow copious attention on your maples, consider these maple mantras. Make sure there’s a drainage hole. I read online that we shouldn't fertilize it after spring time but wondering if you can provide any expert advise. The typical garden fertilizer that you buy for your veggie garden will take out ornamental plants like nobody’s business. 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